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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2953079ae3418a882ea016598abf25a094811dac5b6134e46a352b76e2096070' 
  AND token = 'Se9+MIcOMHGdaZBqE1eid5+fS/lXo0lWDY0aB9XPYrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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