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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf1dc9c0cb7ee8f433d363b1093aad470f626c4a6cf3ae23e92053511c63dc2' 
  AND token = 'HJ8Z6LcFsHyPv5ivvDSbYwC45GwY2n7xkvwdOkBVrRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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