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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29915a41df9f47d0c52f9c30d9e8d9ee13d0ba1962e345adafc10c577e73e85' 
  AND token = '5XdgefuJJU5opu4UfLiw2+HtJgX4DkrzwOpTEBlbEq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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