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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ee7e3a1390443b0a857597d7fb8f9e355684c9415d5d1e27e8dadc0a5e0768' 
  AND token = '5kcaSdkMg4Jb1ckwv4z7A8/5X1a81vf0DpMARFU/mEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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