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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e465fe5354ef002c84f062c74f6632f351304828f47fd53991f280dbc1ac7071' 
  AND token = 'cgHAwyxTNCCwgAnKD4ZzagZ5fQp7J+1S3jDMfMDmlME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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