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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bacefcc073aa4639ee3b31397adac03f0bf2130d1f0ca4f110db4788afadc8' 
  AND token = 'vr8guAlZlh0mLFsBNO1iVDFkFo3K432yNjpgJjJuCbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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