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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777cd50a7b6d9e57cc1df303b26d0c8d5ea784856f9ba5d46d8e706355cd9835' 
  AND token = '+Nya3n8nL3J7tilw0B8O3csr+4qipS7mruIJNgSbxTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}