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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9bd32485d04d8f9948f7cf858cc7d45ad2304b9d66ab631cfffe41b29f033c' 
  AND token = '4Zs11Li8ump0BNI5qC0z4DCPbCOKZeHeRRyMND7gDCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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