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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0d1018e6198f6f786bc59b96d3d2de8c7853dfdd6546ecc25708d34aaa3e9c' 
  AND token = 'f0VNJP1bc140x9fZ/5eyrcoxU1manqIDLN/9vfzjHY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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