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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0155dcaa2082bde6c35f4d4e8797e5568aa223817d1e5058073e4b453322ac' 
  AND token = '10eYloQp+FoubILaBNlEfX1XmX0dTWmcS8b9VEyKIHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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