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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02373de9a844f23414be613002e8bda7d38e74ddcf1f5cfdd60b81a8bf19a7d' 
  AND token = '3yn4Jxh4GDDS0aeKwjwuX1t/WbzNbeZbHhPhfSAphBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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