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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75538eeceda55cb1ae03df49c505d5d20ca41a4fa1f405e434a2da65f9e37c1b' 
  AND token = 'Z98lyFY6/+rKXbmdq43n39ppkTNJJgfktC33CQ3wC1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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