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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb60c1947ea3aa7c0ba42a03f22085dfdfba003ef272ad039db365f325388dc2' 
  AND token = '3bGdosCa18T3RN+9aI1RGAah2f5Z3wMwhAurMp/khHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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