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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4be2610674f767452ed7395b7d661e95a348f722cd6539c60974d9a2f7cd48a' 
  AND token = 'R/DHBBF7/DIIFHOzqr/dz6qEpRf0GMNhbgy+EcE69cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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