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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e392258dc8e0d716cdb2630fd0bbb4d34351f13b06ff03d19583cbc0838c0d6e' 
  AND token = 'Qz1z/wMR6Jq5Mb+g5mqVI+oYfWBcua6wbwNtl/hZIio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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