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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eada3f299e0050785b402776fa4569d7268cd8fe04d1aec26ea1eafed941a14d' 
  AND token = 'wdHuOWSy5jkEeN4Yu86rdaqDA5YPwKLKHFh4RA6danw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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