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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7eb46fe562a4abffc6b111f265b6a304704267911b02032d467ea969cdcd8f' 
  AND token = 'WR2xs9UId/VUxU+qQ4V1Rlyb5j/YILGahdfaz2d+BtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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