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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1606332ae44ba9c120a0a192b2354c12b46d33361724060ec5da0f20bf79833e' 
  AND token = 'z3CJwTWmmQWjwgdrjVVD5fPjMLp4T/CM2QITWeEl214=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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