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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7506df3e6415417ed9ae8ab478d98af9f4a6d7b3ea171ee801fa854db098579' 
  AND token = 'SLRdFtoUZCRoxzu9dcmq0YDJVj72ThT2XCvS/Wj1gIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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