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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b90e06c0c479791ae92c811875585fbed9d3f20eb63bc284733169013841281' 
  AND token = 'xcZoCdu1Bf2qapsQ8+SurfAD/M6SSK2WoDVuEW/itlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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