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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d6bc4bd6e4e389f1bd569c3a6b5efb912824ed255afb495dde62eee3a0dfd4' 
  AND token = '+h43YJ6mtszNrOKs9F967U3AnlCxzT+9vxNpzzTjERU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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