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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070d1d25368ccf7790c6e70e365d5fea5f95affe29bc64a196419d34f7e5018e' 
  AND token = 'WksOcjwud/rjLboAIsL6stlP+LJ0xB20t80BZ6CsCQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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