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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32241a548540e10849829ef8331969beccc601332e852d6ee09069dd75a4398f' 
  AND token = 'g8j7Frb9gkex4o5noJeF7AbSmnW2d1ImzaLCaF9Dr7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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