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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e20347b5f95283d6b1b2ce5785d71f6745a9863c0cc6c51944fceef763d46e' 
  AND token = 'W0CCDl0jOrGeboGhOIMZws6Ku9BW+oAiwi0GN7ZU8Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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