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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9a244cf7df0abfaa12da2202d0e8dc713cdb611c192346f354bb284a1e0ef7' 
  AND token = '2KKPtrzwad9aYnkQq10fZ90GYCQuXijUlKSV4QBAEFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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