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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd284211a51bcdab48d115a7cd8eeed7e8be09ed8e89f85f6683e655e61138d91' 
  AND token = 'S4YIbal9zk8/fUfKteltnVjnuw+McnhSZH5kS3lqDiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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