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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e323a685e2c9a745550f6c097990e5e11cc644c751b16c792435387a3fd40783' 
  AND token = 'mmofsqIgAWzlwXT/+Z12TuMRO1iH7D2QBxnGbaU1MnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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