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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66a7f9d9e4266c8b31f321acdaf8885fe75063c9e8ffbfeeed113db34c87892' 
  AND token = 't8hjTAErHbZ2gfd9peKLQC7GlzuczvWKIn3f//47lgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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