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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d797640a97a9bd474c57c6d6296db3cb47024ba2a5ab89ee9b807e3cd81a006' 
  AND token = 'J4MUl7qGW2ldtW499kB9GG+fS7L7/ulThwa6XptGthM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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