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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e75970cf9ff892ad9ac5e86ea5ee6d5edd5deb101ef907a847cddfaddc426d6' 
  AND token = 'R1BW+O4MIVRHuvtwTjaQaldzW7xcKMuOI8HbdtB0T70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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