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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77c9e9913b033982593e0d808871fd63be436fea138014a5b59d9e27272a113' 
  AND token = '9wPkCE7/xxNlzYMJ9v3krzI+QFQ30Z68PuCT9XVy6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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