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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bd600c9f61d06deae333373212a0f25ffeb6d105cf2378019a0cc79d534696' 
  AND token = 't02Vw8DikT+KlWq92nrFTGPX036i4QtDa7J2iAwf4Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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