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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567d8354e0c3bb53ef174d163a208548adda3a7fb7f028ea6f7868a89f4001e8' 
  AND token = 'qU4UzroJZPq6isH+7whZwpsaBUPTalaDXn1Ae7yg5HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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