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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f9b93c6ab92041c961685bab202e1a3d3b2d99736262b080aaa71715abf23a' 
  AND token = 'DhONVxIa6WWnzvle6Ht6vzth/f3UPtk3Pu/8LVIlhM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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