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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a98e9b4bd15ea9b0c4841f48a2388dde22aad6d75815d1409a235f8a8b99041' 
  AND token = 'FsUDL09LySuBtU5NAoem3DFkYDmnIJFmegoe0eiiiJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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