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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27df08acaa6504cf3ac5eccb050be1f424332d8235e65f7e0b6ece0dd296b031' 
  AND token = 'R71D1M9ag94AyB5Zl6FCJAXj59zTgabDCt69GdYDG7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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