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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e04c784f4c0d6ffb4d5d1b9c367209b5ccab8ad6bf4e75a72bc5708ca38157f' 
  AND token = 'O5kqNBNtU9jNFQNOTaUtLgFKVsyQT/Qz0i7vZF5lqmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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