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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e24ea591d90c9d43e4c0f254ad33b2c22804d381e1a26ef514ab57b1ce4c86' 
  AND token = 'yR7lGW5N3oksNTCXGyPH+CSUt1W2qcnYe9+oTlcJG5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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