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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60bf103c4400b2590030b6674b1225086cd353ae104186a131d3d2dfca309eb' 
  AND token = 'egs086Kg3fF/wZzhpLJG4BJX0dMwhKtsaHVOUY4RJ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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