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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67836f2608776c552922116d0ed99519a9b793db0d61989cf9506f6a4357a453' 
  AND token = '5t8RYrtG3sYDTxevaLbT4E7IXPWp7eOLT9gRGprD/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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