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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4025ba697e8347dcee6150da74b07e55b803b936a47ea30a6bfb0851bf32345' 
  AND token = 'QvnO/s7BTDsk4euNUAx7fMWnSTMdboyqVbVDdtyQI4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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