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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cc5c3924f71e3d3aa8dfd462657bf9937388aeb19f8dcf9b8f08ef3a7b6f45' 
  AND token = 'LcBi5iQFxeYqMgmXtckk4Y9b19b+qcNr/UCb+HEXvqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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