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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4602337428ec30c437adfab489d20f3ddf94e9aebf70cae6c2667deed57c9c8b' 
  AND token = 'MqTAMopAiblnX16v+ae0a72YVx9WRGHi805fXXAAZbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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