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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afe74fedeb2cc11b241003c07ea8802f8252b8e766d415f11832100962c64e2' 
  AND token = 'Ne71pp/vDvW2k/pFWHpJiCltfXOmrdl4XCMt5lb6sh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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