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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1016e8c837adea39ffc66bf2d48632e1c074934b24049f6b4febea5e0ce121e' 
  AND token = 'mYegANd3b/ReGAAYhqv2HKVzgTWv7XGq6g2NSbyvt0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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