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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70742cab3e6c18138fe868f4aeac4681d2d43c063cc09c9f1ca562c21c6de78d' 
  AND token = '0e2rtDhFQOXAgK9cY7rIXHW4EP2wVdAZGYEdumdNZSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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