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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e4272ab68c4da1d5735ee2cf37ee0d6374eb78c88630c6b7f4a3c1c5851cea' 
  AND token = 'QFEgs3ibimehZBzZGkG7S5mxsRCsqoOJxqtGNuRGKA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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