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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff1f3d1a43cd288dfc7966be6fda4611935c2293ef097087610648dba70c1c9' 
  AND token = 'Bu4yVXS8OUYeFi8feKYMv5RZslWTT4DIhplc1oNY7cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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