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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67843e4a9fe1e75f5f6f24f0f7e3664552e951979bb9b16fc05ff6d5ff99937f' 
  AND token = 'dutoZQ9rYQaGAd7aVyb/N3YO5wAGXxoD6mQdX/4PGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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