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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786f61c455ae9d8e6031a099b71ef55830db66d9b88cfa6ae9943fc2112d3522' 
  AND token = 'u+cSL8v0U72yeRu3kmJh4RJmm7yjXJ3I3cbUaRf8eNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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