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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9711210209295e91fdff714173f173fd03f7b125ae80b43c20b446a65829ae55' 
  AND token = 'Kf5RANxr9Dz2TXDHiuuiOIwd115vn12m5/XHVM+F9pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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