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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663dcf0fcd320ea45134d230f1bf94b959eb1813cbe1c31ef1d4ed6a7ff79eb5' 
  AND token = 'xATdzXW1IunXrdNmUzHJTSnPw+y6eGGm2v6C44AciC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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