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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9867fa78c318b38862fb6f5984144c7ef3c300d6f6a2654cab1aabcc0bbc548' 
  AND token = 'sj8MM2DKzTT3teqt3lw2bqWesDBLF6+pMB2W9ML42Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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