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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b08bd258240f183bcbc75f96651bd7547b82d167a1ff6b1835135617298c2d' 
  AND token = 'FRMtN9LKvloUyIpYX+kMOdilugUuc8ad5LR70d6dw6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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