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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e608007e0c1579a98127126fef091a53249f0312d0e743f2219324274f80a680' 
  AND token = '8A3uRJPRhlACs8WND31YVEh7rG3HGH9PE3szmqRR7AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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