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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc03c6e6d70d3ba3346f2ac57eda7ab7b2ad5806866af258f7f3e15494a395b9' 
  AND token = 'DaCWVmBLy1MpCn5OgPDhmasnOA5LZ3ImHw6ZJKhAeQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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