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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ac6c2e32dcc5fccf19e6b532ef46f0b55dc89e41aed08afd8d5356c296beb7' 
  AND token = 'K0wru1yKYv38zRD09pfXgAwzHylYzoWjmiKQHhIOhwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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