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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05e41dfb5dc0acaef37b05267fb116b41677a15d68eb591f7e072f5d97e2842' 
  AND token = 'AqmIHwpCzinpzuf7n97iukc7UD3IDwifgmfl83g4X6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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