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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6223ecf4bc3f0715218d5cc224d48091b014fc9793db522b359ec59022ba3c85' 
  AND token = 'eWdH5UeZDWk4jxEO9y2V24JteqdWMqrvxlEm3YsLTBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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