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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609f7ec0b4ebd3608ea4a1648cbcca7769c651c5867dbdbb303723a0dd7a4dfa' 
  AND token = 'PH7Te7kwfZy/tsNxdbmsdYGkW/mTbTtgzbxVBQRXM8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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