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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b24d3b47ec85cf74296f3eee2ee3d631f097b42cab1b8901cf132d4472f29ea' 
  AND token = 'GPpzIBEqjTCLNu/xXqgVl7iNz9VvX6DnevtTa2EISLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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