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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c585dea05d26a01b8d730b2a3859c4d1dcc4f4bd8cd81032cadd4e4f419ef171' 
  AND token = '6IA4G0wsLIbeD2kLLteBTJPFuJH+bPQ4blTqJ60mOWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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