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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cc42b7bdb0e4cc77e1d44b0355d4e32dbc1394bb8dcd34b4eaa84981a14190' 
  AND token = 'Oo5th/443PDQdi+ULJ3yMgCNovczHUxcjU1tv7XDoFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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