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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd30518dbe4a7d30e831db90f856bd86911d83df5346a92b5a54caf31d0bb35' 
  AND token = '8xkxFimwmziktyVIRg1II6U5bZWwY1gju2iEGCthDmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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