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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7558b3d156d80797bf7751f51b324461df88f5dba27d8674cba2e4a50c8a2d3c' 
  AND token = 'oqbsQty4NUpShHJEfaZyhBX0y0yik+e/5nBu1NoJNJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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