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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c7919a43e264ba3b130fe4cbcb52c7090fd9f50f596cbaba20bb31e0a9f765' 
  AND token = 'Gvfq3PWyEamOsY24kavT7TQezFJO+npT3Rkuffrzt18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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